NAME

SYNOPSIS

DESCRIPTION

[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
the ISO C standard.

The getc() function shall be equivalent to fgetc() , except that if it is implemented as
a macro it may evaluate stream more than once, so the argument should never be an expression with side effects.

RETURN VALUE

ERRORS

EXAMPLES

None.

APPLICATION USAGE

If the integer value returned by getc() is stored into a variable of type char and then compared against the
integer constant EOF, the comparison may never succeed, because sign-extension of a variable of type char on widening to
integer is implementation-defined.

Since it may be implemented as a macro, getc() may treat incorrectly a stream argument with side effects. In
particular, getc(*f++) does not necessarily work as expected. Therefore, use of this function should be preceded by
"#undef getc" in such situations; fgetc() could also be used.